There are only two possibilities in this situation: 1, which was taken by someone, so don't be too sure. You put it in the wrong place, it may not even be in the house.
Don't believe the mysterious theory of disappearing into thin air.
I think I should calm down and think about how to solve the following problems.
Escrow for others, have the obligation to repay, although very grievance, but the value of good faith can be more than this 300 yuan. You can also tell people frankly that the two sides can negotiate a good way.
On the other hand, tell the sisters around you to watch out for you and watch out for you in case it falls somewhere.
Finally, I wish you can remember it smoothly and let your brain have a rest before looking for it!